Capacitor Code Decoder

Decode a ceramic capacitor's 3-digit marking into a capacitance, or encode a value back into the printed code. Runs locally in your browser.

3-digit code

first two = significant, third = multiplier (in pF)

Tolerance letter (optional)

printed tolerance class

Enter a code like 104, 472, or 4R7.

Common 3-digit examples

Code	Value	Code	Value
101	100 pF	223	22 nF
221	220 pF	473	47 nF
472	4.7 nF	104	100 nF (0.1 µF)
682	6.8 nF	105	1 µF
4R7	4.7 pF	R47	0.47 pF

A ceramic capacitor's 3-digit code reads in picofarads: the first two digits are significant figures and the third is a power-of-ten multiplier, so 104 = 10 × 10⁴ pF = 100,000 pF = 100 nF = 0.1 µF. Values under 10 pF use R as a decimal point (4R7 = 4.7 pF). To convert by hand, remember 1 µF = 1000 nF = 1,000,000 pF. Tolerance letters follow the EIA standard — J ±5% and K ±10% are the most common on ceramic caps. Runs locally — nothing leaves your browser.